[Zope-Checkins] CVS: Zope3/lib/python/Zope/App/Service - IServiceManager.py:1.1.2.1 ServiceManager.py:1.1.2.1 __init__.py:1.1.2.1

[Kapil]

Update of /cvs-repository/Zope3/lib/python/Zope/App/Service
In directory cvs.zope.org:/tmp/cvs-serv12657/Service

Added Files:
      Tag: Zope-3x-branch
	IServiceManager.py ServiceManager.py __init__.py 
Log Message:
Added in interfaces and implementation for ServiceManagers in the
zodb instance space.



=== Added File Zope3/lib/python/Zope/App/Service/IServiceManager.py ===
##############################################################################
#
# Copyright (c) 2001 Zope Corporation and Contributors. All Rights Reserved.
# 
# This software is subject to the provisions of the Zope Public License,
# Version 2.0 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE
# 
##############################################################################
"""

Revision information: $Id: IServiceManager.py,v 1.1.2.1 2002/02/08 20:55:59 k_vertigo Exp $
"""
from Interface import Interface
from Zope.ComponentArchitecture.IServiceService import IServiceService

class IServiceManager(IServiceService):
    """
    Service Managers act as containers for Services.
    
    If a Service Manager is asked for a service it
    checks for those it contains, before using a context
    based lookup to find another service manager to delegate
    to. if no other service manager is found they defer
    to the ComponentArchitecture ServiceManager which
    contains file based services.
    """


=== Added File Zope3/lib/python/Zope/App/Service/ServiceManager.py ===
##############################################################################
#
# Copyright (c) 2001 Zope Corporation and Contributors. All Rights Reserved.
# 
# This software is subject to the provisions of the Zope Public License,
# Version 2.0 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE
# 
##############################################################################
"""

Revision information: $Id: ServiceManager.py,v 1.1.2.1 2002/02/08 20:55:59 k_vertigo Exp $
"""

from IServiceManager import IServiceManager

from Zope.ComponentArchitecture.IServiceManagerContainer \
     import IServiceManagerContainer

from Zope.ComponentArchitecture import getService



from Zope.ComponentArchitecture.Service \
     import UndefinedService, InvalidService

from Zope.Exceptions import DuplicationError, NotFoundError

from Zope.App.OFS.IContainer import IContainer
from Zope.App.OFS.Folder.Folder import Folder
from Zope.ContextWrapper import getinnercontext

class ServiceManager(Folder):

    __implements__ = (
        IServiceManager,
        IContainer,
        )

    def __init__(self):
        self.__defs = {}
        Folder.__init__(self)
        
    def defineService(self, name, interface):
        """ see ServiceManager Interface """

        if name in self.__defs:
            raise DuplicationError(name)

        # trigger p machinery
        self.__defs == self.__defs

        self.__defs[name] = interface
    
    def getService(self, object, name):
        """ see IServiceManager Interface"""
        
        service = self.getObject(name, None)
        
        if service:
            return service

        while object is not None:
            object = getinnercontext(object)
            
            if IServiceManagerContainer.isImplementedBy(object):
                sm = object.getServiceManager()
                if sm:
                    return sm.getService(object, name)            

        # fallback to the ComponentArchitecture Service Manager
        # XXX when this called the original object might no longer be
        # the context
        return getService(object, name)

    def provideService(self, name, component):
        """ see IServiceManager Interface"""        

        if name in self.objectIds():
            raise DuplicationError(name)

        if name not in self.__defs.keys():
            raise UndefinedService(name)

        if not self.__defs[name].isImplementedBy(component):
            raise InvalidService(name, component, self.__defs[name])
        
        self.setObject(name, component)





=== Added File Zope3/lib/python/Zope/App/Service/__init__.py ===
##############################################################################
#
# Copyright (c) 2001 Zope Corporation and Contributors. All Rights Reserved.
# 
# This software is subject to the provisions of the Zope Public License,
# Version 2.0 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE
# 
##############################################################################
"""

Revision information: $Id: __init__.py,v 1.1.2.1 2002/02/08 20:55:59 k_vertigo Exp $
"""